Predictive Distribution Modelling of Calamus andamanicus Kurz, an Endemic Rattan from Andaman and Nicobar Islands, India

Abstract

Calamus andamanicus Kurz is one of the commercially important solitary rattans endemic to Andaman and Nicobar islands. The habitat suitability modeling program, MaxEnt, was used to predict the potential ecological niches of this species, based on bioclimatic variables. The study revealed high potential distribution of C. andamanicus across both Andaman and Nicobar islands. Of the 33 spatially unique points, 21 points were recorded from South and North Andamans and 12 from Great Nicobar Islands. The islands like Little Andaman, North Sentinel, Little Nicobar, Tllangchong, Teressa were also predicted positive even though this rattan is not recorded from these islands. Mean diurnal range, higher precipitation in the wettest month of the year, annual precipitation and precipitation in the driest month are the main predictors of this species distribution.

Genetic erosion and population decline in four threatened rattan species of India: insights from genome-wide microsatellite analysis

“…A total of 81 occurrence points for C. brandisii, 11 for C. acanthospathus were recorded. The occurrence points identi ed earlier in the ecological niche models using MAXENT for C. nambariensis and C. andamanicus(Sreekumar et al 2016;Deka et al 2018), coincided with the points in the current study. Consequently, these species were omitted from the analysis.…”

“…The ENM prediction reported earlier for C. nambariensis and C. adamanicus revealed wider niches for both the species. However, the highelevation humid tropical and subtropical forests of Assam, and evergreen forest of Andaman and Nicobar Islands are the most suitable area for these species, respectively(Sreekumar et al 2016;Deka et al 2018) requires conservation strategies and management actions focused on enhancing population size, fostering genetic connectivity among populations and augmentation of genetically deprived populations. Furthermore, habitat protection and controlled harvesting can help regain the viability of these populations.Ex-situ conservation can be used as a tool to conserve a signi cant proportion of genetic variability in highly threatened species(Guerrant et al 2004;Hoban 2019).…”

Pakkat (Calamus sp.): Pangan Lokal Masyarakat di Kota Padangsidimpuan

“…Namun, Calamus sp. akan dibiarkan tumbuh untuk dipanen beberapa tahun kemudian (Sreekumar & Sasi, 2019). Sombun (2005) menjelaskan bahwa budi daya Calamus sp.…”